The Ancient alphabet was invented for the game Starbound. It is used to write the language of the Ancients, and is actually a substitution cipher of English.
The Ancients were a highly advanced race and have left behind many structures throughout the universe. Their alphabet can be found in most of these structures and can be translated to reveal some of their background story.
We advanced as we were designed. We reached the Great Kind One.
It warned us of the final plague, the threat to all that thrive.
The Great One had a plan. A door of keys for the chosen.
But we were builders, not heroes. In the event that the plan failed,
We carved the Infinite Sanctuary to salvage what little life we could.
We are destined to not remain, as is the Great One.
Its legacy will be its remnants, and ours shall be our temples.